Surely, you've heard it before, but wholeheartedly, you'd better believe that's it's
okay pretty fabulous to mix-match place settings, rather than employ one matching set. All of these old plates were ones I found in thrift shops, on eBay (search Czech plates, vintage plates, or Bavarian porcelain), or, well, in thrift shops... Seemingly random in nature, but all it takes is a united color scheme, or pattern, or degree of gilding, to pull them together.
Besides, you don't want to look like the sort of person who
buys his silver, do you?